Speaker
Description
Active galactic nuclei (AGNi) are compact regions that emit throughout the electromagnetic spectrum. Blazars, a subclass of AGNi with their relativistic jets closely aligned with our line-of-sight, are especially powerful sources of $\gamma$-rays. Furthermore, the unified scheme for radio-loud AGNi classifies radio galaxies as the misaligned parent population of blazars. This would make them intrinsic producers of high-energy (HE, $E> 100$ MeV) and very high-energy (VHE, $E > 100$ GeV) $\gamma$-rays. However, early-generation observatories did not detect them at such high frequencies. It was understood that while emissions would be Doppler boosted in blazars, this would not be the case in radio galaxies. Recently, advances in $\gamma$-ray observatories have led to the detection of radio galaxies at these frequencies. To explain these emissions without relying on Doppler boosting, we leveraged a Monte-Carlo code that propagates $\gamma$-rays in an AGN environment, leading to secondary $\gamma$-ray and electron-positron pair cascades. In the code, we consider homogeneous external radiation from the broad-line region and anisotropic external radiation from a thin Shakura-Sunyaev accretion disk. In this work, we implement a toroidal magnetic field and compare the resulting spectral energy distributions to previous work where a uniform, static magnetic field was considered.
| Stream | Science or Engineering |
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